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m in (-oo:+oo)
7/10 = m/4 // - m/4
7/10-(m/4) = 0
7/10-1/4*m = 0 // - 7/10
-1/4*m = -7/10 // : -1/4
m = -7/10/(-1/4)
m = 14/5
m = 14/5
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